diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index aff7e7a..5fe2f8b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,37 +1,49 @@
 ---
 name: build
 
-on: [
-  push,
-  pull_request
-]
+on:
+  push:
+  pull_request:
+  repository_dispatch:
+    types: [apb]
+
+env:
+  PIP_CACHE_DIR: ~/.cache/pip
+  PRE_COMMIT_CACHE_DIR: ~/.cache/pre-commit
 
 jobs:
-  build:
+  lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v1
         with:
           python-version: 3.8
+      - name: Store installed Python version
+        run: |
+          echo "::set-env name=PY_VERSION::"\
+          "$(python -c "import platform;print(platform.python_version())")"
       - name: Cache pip test requirements
         uses: actions/cache@v1
         with:
-          path: ~/.cache/pip
-          key: "${{ runner.os }}-pip-test-\
+          path: ${{ env.PIP_CACHE_DIR }}
+          key: "${{ runner.os }}-pip-test-py${{ env.PY_VERSION }}-\
             ${{ hashFiles('**/requirements-test.txt') }}"
           restore-keys: |
+            ${{ runner.os }}-pip-test-py${{ env.PY_VERSION }}-
             ${{ runner.os }}-pip-test-
             ${{ runner.os }}-pip-
       - name: Cache pre-commit hooks
         uses: actions/cache@v1
         with:
-          path: ~/.cache/pre-commit
-          key: "${{ runner.os }}-pre-commit-\
+          path: ${{ env.PRE_COMMIT_CACHE_DIR }}
+          key: "${{ runner.os }}-pre-commit-py${{ env.PY_VERSION }}-\
             ${{ hashFiles('**/.pre-commit-config.yaml') }}"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           pip install --upgrade --requirement requirements-test.txt
+      - name: Set up pre-commit hook environments
+        run: pre-commit install-hooks
       - name: Run pre-commit on all files
         run: pre-commit run --all-files
diff --git a/.gitignore b/.gitignore
index 3cec028..bedb6e4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
-*.egg-info
 __pycache__
-.python-version
 .coverage
 .mypy_cache
 .pytest_cache
+.python-version
+*.egg-info
diff --git a/.mdl_config.json b/.mdl_config.json
index 492955a..7a6f3f8 100644
--- a/.mdl_config.json
+++ b/.mdl_config.json
@@ -3,5 +3,8 @@
     "code_blocks": false,
     "tables": false
   },
+  "MD024": {
+    "allow_different_nesting": true
+  },
   "default": true
 }
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 793b329..daf3dac 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,7 +33,7 @@ repos:
         args:
           - --config=.mdl_config.json
   - repo: https://github.com/adrienverge/yamllint
-    rev: v1.20.0
+    rev: v1.21.0
     hooks:
       - id: yamllint
   - repo: https://github.com/detailyang/pre-commit-shell
@@ -47,7 +47,7 @@ repos:
         additional_dependencies:
           - flake8-docstrings
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.0.0
+    rev: v2.1.0
     hooks:
       - id: pyupgrade
   - repo: https://github.com/PyCQA/bandit
@@ -60,12 +60,12 @@ repos:
     rev: 19.10b0
     hooks:
       - id: black
-  # Disabling seed-isort-config since it doesn't identifying docopt, et al.
-  # as third-party libraries.
-  #- repo: https://github.com/asottile/seed-isort-config
-  #  rev: v1.9.4
-  #  hooks:
-  #    - id: seed-isort-config
+  # Disabling seed-isort-config in this project (development-guide) since it
+  # doesn't identify docopt, et al. as third-party libraries.
+  # - repo: https://github.com/asottile/seed-isort-config
+  #   rev: v2.1.0
+  #   hooks:
+  #     - id: seed-isort-config
   - repo: https://github.com/pre-commit/mirrors-isort
     # pick the isort version you'd like to use from
     # https://github.com/pre-commit/mirrors-isort/releases
@@ -78,19 +78,19 @@ repos:
       - id: ansible-lint
       # files: molecule/default/playbook.yml
   - repo: https://github.com/antonbabenko/pre-commit-terraform.git
-    rev: v1.12.0
+    rev: v1.29.0
     hooks:
       - id: terraform_fmt
-      - id: terraform_validate_no_variables
+      - id: terraform_validate
   - repo: https://github.com/IamTheFij/docker-pre-commit
     rev: v1.0.1
     hooks:
       - id: docker-compose-check
   - repo: https://github.com/prettier/prettier
-    rev: 1.19.1
+    rev: 2.0.4
     hooks:
       - id: prettier
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.761
+    rev: v0.770
     hooks:
       - id: mypy